Graco Optimiser 2K 02748 Instructions Manual page 22

13. Install the spring (15) and fluid adjustment nut (6).
Tighten the nut to 25 to 35 in-lbs (2.8 to 4.0 N m).
See Fig. 42.
14. Install the spring (16) and fluid adjustment knob (8).
15. Re-assemble the activator valve assembly. See
Fig. 42.
a. Make sure the thin end of the needle (49d) is
straight to avoid scratching the inside of the
nozzle.
b. Install the o-ring (49g), spreader (49r), and
activator packing nut (49h) into the housing
(49b), orientated as shown in Fig. 41. Start the
packing nut threads, then install the needle
(49d). Tighten the packing nut to 20 in-lbs
(2.3 N m).
Fig. 41
c. Assemble the remaining parts.
d. Secure the activator housings (49b and 49a)
with the four screws (49k). Tighten them
evenly to 5 in-lbs (0.6 N m).
CAUTION
To avoid damaging the plastic threads, do not over-
tighten the screws (49k).
16. Install the restrictor (55), flat side up, into the
activator outlet housing (49a).
17. Place the o-ring (49e) in the groove in the activator
outlet housing (49a). Lightly lubricate the o-ring.
Service
49h
49r 1
49g
49b
1
Spreader taper faces
away from o-ring
02781A
18. Secure the activator valve (49) to the plate (2) with
the two screws (53). Tighten the screws to 10 to
15 in-lbs (1.1 to 1.7 N m).
19. Place the o-ring (49e) in the groove on the plate
(2). Lightly lubricate the o-ring, and slide the plate,
with the activator valve assembly, onto the top of
the gun body.
20. Install the gun and activator triggers (3 and 48).
Tighten the screw (5) to 25 to 35 in-lbs (2.8 to 4.0
N m).
21. Trigger the gun to test the fluid needle (21) move-
ment. If the fluid needle does not return after the
trigger (3) is released or returns slowly, loosen the
packing adjustment nut (31) until the needle
returns freely. See Fig. 39. Repeat this process to
test the activator needle (49d).
22. Adjust the two activator needle hex nuts (49j and
49p) as follows:
a. Pull the gun trigger (3) back until you feel
resistance against the main fluid needle (21).
b. With the activator trigger (48) resting against
the gun trigger (3), screw the nuts (49j and
49p) up against the activator trigger. Tighten
the two nuts against each other in this posi-
tion.
c. When properly adjusted, both fluid needles (21
and 49d) will unseat at the same time as you
pull back on the trigger.
23. Lubricate and install the fluid nozzle seal (17).
24. Install the fluid nozzle (20), air cap seal (47), air
cap ring (12) and air cap (19) as instructed on
page 8.
25. Connect the nylon tube (51) between the activator
valve outlet elbow (52) and the spray gun elbow
(52).
26. Make sure the adhesive packing assembly (39) is
sealing by spraying water at low pressure before
fully pressurizing the gun.
If the fluid packings leak, tighten the packing
adjustment nut (31) slightly and retest until the
packings seal completely.